- (music theory) An interval of eight tones on a diatonic scale, representing a doubling or halving in pitch.
- The melody jumps up an octave at the beginning, then later drops back down an octave.
- The singer was known for astounding clarity over her entire five-octave range.
- (music theory) The pitch an octave higher than a given pitch.
- The bass starts on a low E, and the tenor comes in on the octave.
- (fencing) The eighth defensive position, with the sword hand held at waist height, and the tip of the sword out straight at knee level.
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Full Definition of octave